UE4中读取Texture2D的像素值

目的是在UE中获取到一张Texture2D图片的所有像素值，并将这些像素值进行某些处理并保存到另外一个Texture中。

第一步：获取到Texture2D资源

Unreal Engine 4 Documentation

• Referencing Assets

对于高速化来说异步加载资源也是好的解决方案

Ureal Engine 4 Documentation

• Asynchronous Asset Loading

参考的文章

• Accessing pixel values of Texture2D

  • First you need to understand that a texture is normally, a sum of multiple images called MipMaps. MipMaps are down-scaled versions of your images, always in steps of power of 2, so the original image, is, say, 512x512 - this would be the MipMap “0”, then the engine generates the MipMap “1” which is 256x256 and then MipMap “2” which is 128x128, this continues on down to 16x16 I think. The farther away the texture is rendered, the smaller version of the image is used. This means that you need to access the mipmap 0 of your texture.

对上面的答案进行了非常好的总结的文章

• UE4 – Reading the pixels from a UTexture2D

• Reading data from UTexture2D

之后附上完整的代码

UE4中的资源管理

• Asset Management

拓展知识

在代码中看到了static_cast这个语句，竟然不知道是做什么的。查了一下

• C++中static_cast, dynamic_cast, const_cast用法/使用情况及区别解析

之后要好好整理一下。